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Other current assets and other long-term assets (Tables)
9 Months Ended
Sep. 30, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Current Assets

Other current assets consisted of the following (in thousands):
 
September 30,
 
December 31,
 
2019
 
2018
Prepaid expenses
$
6,230

 
$
1,261

Deposits and other receivables
2,247

 
1,841

Interest receivable
1,618

 
768

Right-of-use asset
341

 

 
$
10,436

 
$
3,870